Question 7 1 p Let xy = 3x + y - 5. Find - at (2, 1). da O 11/2 O - 1/2 O - 1 O 1/2 O 1 D Question 8 1 pts Find the relative extrema of the function f(a) = 825 - 12023 + 43. relative maximum at a = -3 and a - 3; relative minimum at a = 0. relative maximum at z - 3: relative minimum at a = -3. relative maximum at z = 0; relative minimum at a = -3 and a = 3